Understanding the Adverse Effects of Inlet Valve Deposits on SI Engine Operation, through a Novel Technique to Create Surrogate Deposits

2018 ◽  
Author(s):  
Andreas F. G. Glawar ◽  
Pauline R. Ziman ◽  
Kaihua Wu ◽  
Vinod Natarajan ◽  
Eike J. Wolgast ◽  
...  
Keyword(s):  
Adverse Effects ◽  
Si Engine ◽  
Inlet Valve ◽  
Engine Operation ◽  
Novel Technique

scholarly journals The effect of LPG injector position on the SI engine operation

2007 ◽  
Vol 131 (4) ◽  
pp. 33-41
Author(s):  
Piotr JAKLIŃSKI ◽  
Łukasz GRABOWSKI ◽  
Mirosław WENDEKER ◽  
Jacek CZARNIGOWSKI ◽  
Piotr SZCZĘSNY ◽  
...  
Keyword(s):  
Peak Pressure ◽  
Injection System ◽  
Intake Manifold ◽  
Si Engine ◽  
Inlet Valve ◽  
Engine Operation ◽  
Toxic Emissions ◽  
Pressure Peak ◽  
Operation Parameters

The paper presents results of experiments on operation parameters of a 4-cylinder Holden 2.0 MPFI engine, supplied with LPG by means of sequential intake-manifold injection system, in the function of the distance between the injection ferrule and the cylinder’s inlet valve. Four positions of the injection ferrule along the manifold were tested, i.e. 115, 170, 230 and 310 mm from the valve. Indicated pressure, peak pressure and toxic emissions, in the function of injection start angle, were analyzed and compared for each position. The importance of the distance between injection ferrule and inlet valve was proved.

scholarly journals The evaluation of the regularity of the combustion process in the SI engine fueled with petrol and ethanol

2017 ◽  
Vol 168 (1) ◽  
pp. 94-99
Author(s):  
Zdzisław STELMASIAK ◽  
Dariusz PIETRAS
Keyword(s):  
Ethyl Alcohol ◽  
Research Work ◽  
Combustion Process ◽  
Spark Ignition Engine ◽  
Dual Fuel ◽  
Performance Parameters ◽  
Si Engine ◽  
Inlet Valve ◽  
Engine Operation ◽  
The Subject

In the paper are presented results of a research work concerning automotive spark ignition engine fueled with ethyl alcohol. The research was performed on a Fiat 1100 MPI engine adapted to dual fuel feeding. Injection of ethyl alcohol was accomplished in area near inlet valve with use of original injectors, the same as used in case of gasoline feeding. The subject-matter of the study was to compare smoothness of engine operation fueled with alcohol in relation to parameters of the engine fueled traditionally with gasoline. There were analyzed combustion parameters calculated on the basis of recorded indicated diagrams of successive individual combustion cycles and averaged diagrams of successive 50 cycles. Performed investigations are pointing at smooth engine operation running on neat alcohol, and on improvement of performance parameters such as effective power and overall efficiency.

EGR Effects on Boosted SI Engine Operation and Knock Integral Correlation

2012 ◽  
Vol 5 (2) ◽  
pp. 547-559 ◽  
Author(s):  
Bjoern Hoepke ◽  
Stefan Jannsen ◽  
Emmanuel Kasseris ◽  
Wai K. Cheng
Keyword(s):  
Si Engine ◽  
Engine Operation

scholarly journals Experimental Investigation of Using Ethanol-Gasoline in Spark Ignition Engine

2018 ◽  
Vol 21 (3) ◽  
pp. 368-373
Author(s):  
Kadhim Fadhil Nasir
Keyword(s):  
Spark Ignition Engine ◽  
Brake Specific Fuel Consumption ◽  
Si Engine ◽  
Pure Ethanol ◽  
Engine Operation ◽  
Brake Thermal Efficiency ◽  
Brake Power ◽  
Operation Parameter ◽  
Ethanol Addition ◽  
And Performance

The consequence of mixing pure ethanol with gasoline on the pollution and performance of SI engine are investigated experimentally in the existent study. The SI engine that employed in the experiment is a single cylinder four stroke. Analysis is carried out for engine operation parameter, CO2, CO and unburned HC productions. The measurements are recorded for several engine speeds from 1500 – 3000 rpm with load and ethanol addition of (0E, 10E, 20E, 30E, 40E, 50E,). The results displayed increasing in brake power, and brake thermal efficiency while the brake specific fuel consumption decreases when the ethanol- gasoline blends fuel increases. Also it was found that CO, HC, and CO2 concentrations decrease when the ethanol- gasoline increases. The best results obtained in the study is for the blend of E-50.

scholarly journals Improving the effective efficiency of a spark ignition engine through the use of a fully independent valve control system

2021 ◽  
Author(s):  
Zbigniew Żmudka ◽  
Stefan Postrzednik
Keyword(s):  
Charge Exchange ◽  
Spark Ignition Engine ◽  
Theoretical Research ◽  
Si Engine ◽  
Load Range ◽  
Engine Operation ◽  
Engine Load ◽  
Effective Work ◽  
Partial Load ◽  
Valve Control

The article presents theoretical research of the proposed system of fully independent valve control (FIVC) of the SI engine. The analysis included controlling the movement of the intake valves, which results in adjusting the mass of the fresh charge to the current engine load, as well as the movement of the exhaust valves, where the main aim is to keep the rest of the exhaust gas in the cylinder, i.e. implementation of internal EGR. The open theoretical Seiliger-Sabathe cycle with the classic throttle regulation of load is the reference cycle for assessment of benefits and study of the effectiveness of obtaining work as a result of application of the FIVC system. A comparative analysis of the effectiveness of application of the proposed system was carried out based on the selected quantities: fuel dose, cycle work, relative work of charge exchange and cycle efficiency. The use of the FIVC to regulate the SI engine load makes it possible to eliminate the throttle and thus reduce the charge exchange work, especially in the partial load range. And this then leads to an increase in internal and effective work, which in turn results in an increase in the effective energy efficiency of an engine operation.

scholarly journals Performances of a Research CFR Octane Rating Unit Engine and Dacia Single Cylinder SI Engine Ignited by a LASER System

2019 ◽  
Vol 112 ◽  
pp. 01009
Author(s):  
Bogdan George Done ◽  
Ion Copae
Keyword(s):  
New Technologies ◽  
Combustion Process ◽  
Pollutant Emissions ◽  
Laser Medium ◽  
Si Engine ◽  
Engine Operation ◽  
Single Cylinder ◽  
Spark Plug ◽  
Octane Rating ◽  
Laser Spark

At this time, the severe legislation regarding the level limits of the waste and exhaust gases released by thermal engines and also the necessity of engines efficiency improvement boost the engine research domain to bring in front the use of new technologies that can be used to control the in-cylinder combustion process. Now, the new technologies is represented by LASER spark plug systems which can be successfully used at petrol engines. LASER spark plug technology can have many advantages for engine operation control, an ignition system that could provide improved combustion is the one using plasma generation and a Q-switched LASER that results in pulses with high MW power. The LASER spark plug device used in the current research was a LASER medium Nd:YAG/Cr4+:YAG ceramic structure made up of a 8.0-mm long, 1.0-at.% Nd:YAG ceramic, optically-bonded to a Cr4+:YAG c. It was developed and constructed similar to classical spark plug and could be assembled on a CFR Octane Rating Unit Engine as well as on a Dacia Single Cylinder SI Engine which led to several results among which: influences on in-cylinder pressure, combustion and pollutant emissions.

A Numerical Simulation of Analysis of Backfiring Phenomena in a Hydrogen-Fueled Spark Ignition Engine

2016 ◽  
Vol 138 (10) ◽  
Author(s):  
K. A. Subramanian ◽  
B. L. Salvi
Keyword(s):  
Greenhouse Gas Emission ◽  
Hot Spot ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Intake Manifold ◽  
Injection Timing ◽  
Si Engine ◽  
Engine Operation ◽  
Study Results ◽  
Residual Gas

Hydrogen utilization in spark ignition (SI) engines could reduce urban pollution including particulate matter as well as greenhouse gas emission. However, backfiring, which is an undesirable combustion process of intake charge in hydrogen-fueled SI engine with manifold-based injection, is one of the major technical issues in view of safety of engine operation. Backfiring occurs generally during suction stroke as the hydrogen–air charge interacts with residual gas, resulting in flame growth and propagation toward upstream of engine's intake manifold, resulting in stalling of engine operation and high risk of safety. This work is aimed at analysis of backfiring in a hydrogen-fueled SI engine. The results indicate that backfiring is mainly function of residual gas temperature, start of hydrogen injection timing, and equivalence ratio. Any hot-spot present in the cylinder would act as ignition source resulting in more chances of backfiring. In addition to this, computational fluid dynamics (CFD) analysis was carried out in order to assess flow characteristics of hydrogen and air during suction stroke in intake manifold. Furthermore, numerical analysis of intake charge velocity, flame speed (deflagration), and flame propagation (backfiring) toward upstream of intake manifold was also carried out. Some notable points of backfiring control strategy including exhaust gas recirculation (EGR) and retarded (late) hydrogen injection timing are emerged from this study for minimizing chance of backfiring. This study results are useful for development of dedicated SI engine for hydrogen fuel in the aspects of elimination of backfiring.

scholarly journals Realization of the Atkinson-Miller cycle in spark-ignition engine by means of the fully variable inlet valve control system

2014 ◽  
Vol 35 (3) ◽  
pp. 191-205 ◽  
Author(s):  
Zbigniew Żmudka ◽  
Stefan Postrzednik ◽  
Grzegorz Przybyła
Keyword(s):  
Charge Exchange ◽  
Flow Resistance ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Miller Cycle ◽  
Inlet Valve ◽  
Engine Operation ◽  
Engine Load ◽  
Part Load ◽  
Valve Control

Abstract The theoretical analysis of the charge exchange process in a spark ignition engine has been presented. This process has significant impact on the effectiveness of engine operation because it is related to the necessity of overcoming the flow resistance, followed by the necessity of doing a work, so-called the charge exchange work. The flow resistance caused by the throttling valve is especially high during the part load operation. The open Atkinson-Miller cycle has been assumed as a model of processes taking place in the engine. Using fully variable inlet valve timing the A-M cycle can be realized according to two systems: system with late inlet valve closing and system with early inlet valve closing. The systems have been analysed individually and comparatively with the open Seiliger-Sabathe cycle which is a theoretical cycle for the classical throttle governing of the engine load. Benefits resulting from application of the systems with independent inlet valve control have been assessed on the basis of the selected parameters: fuel dose, cycle work, charge exchange work and a cycle efficiency. The use of the analysed systems to governing of the SI engine load will enable to eliminate a throttling valve from the system inlet and reduce the charge exchange work, especially within the range of part load operation.

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